N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                                Slide 7 of 76 _________________                                                                                  __________

                          Principle of Fiber Transmission

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The fiber cladding has a lower refractive index than the fiber core. The entering light wave is reflected back to the center of the core. The cladding is formed by infusing impurities into the fiber.